Cam-grinder attachment for grinding-machines.



H. T; SHEARER.

CAM GRINDER ATTACHMENT FOR GRINDING MACHINES.

1 APPLICATION FILED DEC. 17, 1910. 1,115,596. Q Patented Nov. 3, 1914.

Ill

V if

Wu vwcmfoz meow/o II) 7 APPLICATION FILED DEO.17; 1910.

Patented Nov. 3, 1914.

4 SHEETS-SHEET 2.

wuwwtoz H. '17, SHEARER. 1 GAMBBINDER ATTACHMENT FOR GRINDING MACHINES.

APPLICATION FILED DEC. 17, 1910.

Patented Nov. 3, 1914.

4 SHEETS-SHEET 3.

Y H. T. SHBARER. GA-M GRINDER ATTACHMENT FOR GRINDING MACHINES.

I APPLICATION TILED DEC. 17, 1910'.

Patented Nov. 3,1914,

4 SHEBTSSHEET 4.

sra rns PATENT @Fhlifiiit HARRY '1. SHEARERJOF WAYNESBCRO, PENNSYLVANIA,ASSIGNOR- TO LANDIS TOOL GOMPANY, :3 WAYNESBORO, PENNSYLVANIA, ACORPORATION OF PENNSYL Vania.

' oaancmunsa arrao nvmm r012 GRINDING-MACHINES.

specification of Letters Patent- Patented Nov. a, ran a.

Application filed December 17, 1910. Serial No. 597,900.

To all whomit may concern Be it known that I, HARRY T. Saa inen, acitizen of the United States, residing at lt aynesboro', in the countyof Franklin and Landis slain or universal grinding machine to ada t thesame for rindin cams 7 U D and cam-shafts, whereby the machine may beadapted for such work without alterations otherthan the removal of theheadstock and tail-stock and, the. placing of said attachment inposition, and it consists in the construction and arrangement of partsof the mechanism of-such an attachment whereby said object isaccomplished, all as will be,

hereinafter fully described and claimed.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts, Figure lis a fragmentary perspective View of one end of a Landis universalgrinding machine showing my said attachment in position thereon, Fig. 2aefront elevation oiisaid attachment as mounted upon the work-table, acentral portion being broken away in order to illustrate the parts on alarger scale, Fig. 3 a cross section on th dotted line 8-3 in Fig. 2,Fig. +1 a cross section on the dotted line 44[ in Fig. 2, Fig. 5 an endelevation as seen when looking in the direction indicated by the arrowfrom the dotted line 55 in Fig; 2, Fig. 6 is a detail viewillustratii'ig a form of chuck for holding the end of the master cam,Fig. 7 a

similar view illustrating a form of chuck employcdwhcre the end of thecam-shaft )attern carries a disk. Fi s. 8 and 9 detail sections througha portio'i'i of the swinging frame illustrating the work SllpPOltlliQ'and grinding wheel truing devices respectively, Fig. 10 is a detail viewillustrating a portion of the chuck construction, Figs. ll and 12 detailviews illustrating the work holding devices respectively. and Fig. 13 adetail section on the dotted line 13--13 in Fig. 3.

in said drawings the portions marked A represent he bed of the grindingmachine,

B the Work supporting table, and C the frame f the cam grindingattachment. The bedA, grinding-wheel carriage A, and the Various otherparts of the machine except those relating to the cam grinding attachment, are of a well'kno'wn, or any approved,

construction and need no special description except lncidentally 1ndesc'ibing the invenr tion. flie work-table Bis any ordlnary or approvedform of grinding machine worl;-

table, mounted on the bed A, as shown. The frame C of the cam grindingattachment is a heavy casting of a length sutlicient to accommodate thelength of the longest cam-shaft which it is desired to grind with theattachment. It consists of heavy end plates, of suitable form to'carrythe bearings, gear, etc, mounted thereon, connected by a web of suitableform to receive and carry the parts to be supported thereby; It ismounted to swing between suitable supports C and C being carried onpivots c-and c which extend through bearings near the top of saidsupports and in the upper forward corners of the ends of said frame. Thesupports C and (l -are secured to the worktable B by clamping bolts Z)the heads of which engage with the T-slot in said table, in the samemanner that the head-stock and foot-stock are ordinarily secured inplace.

Said frame is of the form in cross section best shown in Figs. 3 and 4and has a longitudinal T-slot t in the under face of its upper portionin which are mounted a series'of hangers 11 carrying bearings to supportthe pattern, or master cam-shaft. The bearings in said hangers 11 areformed of bronze bushings, or bushings of other suitable material, whichmay be made of different sizes to accommodate different sized shafts andchanged as necessary to accommodate the size to be ground. A chuck C forcarrying one end of the master cam-shaft and con- Jlin it to the drivingmechanism is con- 1 b t each shoe being the arc of a circlesubstantially corresponding to the circle of the grinding wheel. Theshoe in use thus bears the same relation to the master cam as the workto the grinding wheel and an accurate reproduction of the pattern isthereby insured. One shoe is. provided for each inch diameter of thewearing part of the wheel and in use the wheel is worn from a diameterone-half inch larger than the diameter of the circle on which the faceofthe shoe is formed to one-half inch smaller, when the shoe is changedfor the one of next smaller size. The standard B may be adjusted alongtable B to any position desired between supports C and C? by looseningthe clamping nut [2 which will permit said standard to he slid freelyalong the table B. On the end of frame C adjacent to the supports C isformed a projecting lug 12 which normallyrests a ainst a cam 13 on theinner end of a short s aft 14, which is journaled in suitable hearingsin support C Said shaft let is provided with a crank 15 by which it andsaid cam 13 ,thereon may be turned. A lug 16 is formed on the inner sideof said crank 15 which is adapted to strike against a lug 17 or aglug18, according to which ever position, F-ild lever may stand, on theouterface of support C As shown in Figs. 2 and 5 the lever 15 stands inits upturned position with the lug 16in contact with the lug 17 and oneof the cams of the master cam-shaft M resting on the shoe 6, which thusfurnishes the support for-the lower side of frame C on. its pivots o.Then it is desired t'olift said frame free from shoe 7), lever15 isturned downward until its lug1 17 strikes lug 18, which turns cam 13 sot at, operating against lug 12, it will swing frame C forward andupwardon its pivot to free. the master cam from said supporting shoe. This maybe found necessary when the standard B, carrying said shoe, is shiftedalong the table 13 to bring said shoe into operative contact with one orthe other of thecams of the master cam -shaft, or when it is desired tochange the shoe for a purpose previously described.

The work-holding devices are mounted on the opposite side of frame C andconsist of a head-stock comprising a spindle 20 at one end of said frameand adapted to support one end of the shaft constituting the work and atail-stock carried in a suitable socket on the opposite end of saidframe, and formed to be longitudinally adjusted to engage with the'opposite end of said work. Said tail-stock consists preferably of acylinder 21 adapted to slide in a socket formed gin a'hracket 22mountedon frame 0 and securedf by a top flange engaginga flange 47 onsaid frame and a clamping bolt 23 the head of which engages alongitudinal T-slot in the face of said frame. A spring 24 is interposedbetween the inner end of said cylinder and a screw-cap 25 in the outerend of the socket, which spring normallytends to force the" center 26,carriedin the inner end of said cylinder 21, against and into the work.A iQWQl' 27 mounted on a pivot 28 on the outside of the bracket 22extends through a slot in said bracket and 'its inner end is formedspherical and engages with a groove in said'cylinder whereby the center26 may be withdrawn from the end of the work when desireds Thehead-stock spindle 20 at the opposite end is journaled in bearingsprovided therefor in the end of frame C and carries a center 29 toengage the opposite end of the work. Between its bearings. it isprovided with a gear 3O adapted to mesh with a gear 31 on the maindriving shaft 1. (See Fig. 13). Said driving shaft 1 is provided with adriving pulley 2. A gear-wheel 32 of corresponding size to the gearwheel 30 is mountedfon a journal 33 adjacently located and meshes with agearwheel 34, also of corresponding size, on the shaft of the mastercam-chuck, thusinsuring that the master cam and the work being groundshall be driven positively and at a uniform speed. A brake consisting oftwo parts 35 and 36 in the form of a yoke is mounted'around the chuck CSaid arts 35 and 36 are suitably lined with leather or other appropriatematerial and secured to gether by clamping screws 37 by which said partsmay be clamped upon the outer surface of said chuck C to securewhatever'fric-- tional resistance maybe desired. The upper end of part35 is formed bifurcated and engages with a pin 39 mounted inaperforation formed in a boss 0*, on the underside of the top of frame C.By this means the master cam is held from rotation except aspositively,,driven by the power applied to the driving gear, and allslipping, such as might be permitted by any gii e, or looseness, in

gear and all slipping or vibration, or backlash is prevented. Said chuckC is connected to the shaft 10 by means of auniversal coupling, thechuck and shaft being formed with enlarged disk flanges 70 and-71 ontheir adjacent ends each of which is provided with two horizontalprojecting pins 72 and 73 on diametrically opposite sides, the pins ofone flange being 90 from the pins of the other flange. A disk 74 formedwith radial notches 90 apart around its preiphery is interposed betweensaid flanges, the pins of the other flange engaging the other, twonotches in said disk. Said pins iso are of a length not quite equal totherthickness of the disk 74 so that the chuck C s thus connected to theshaft 10 to be capable of a slight independent axial movement and tionis important as it is frequently diffijusted.

cult to adjust the, axis of a pattern to true axial alincnient with thedriving shaft.

A collar it is clamped upon head-stock spindle 20 by a clamping screw4:1 and the outer end of arm 4-3 of the work engaging sleeve at? issecured in a radial recess in one side thereof by a set-screw 44.Worksteaying rests are mounted at suitable interva apart on the frontside of frame C to support and steady the work against springing orvibration under action of the grinding wheel. Each of said restsconsists of a-casting 45 formed with side flanges 46 adapted to hookover a longitudinal rib 17 formed on the front side of said frame C.(See Fig. 8.) Said casting is formed with a vertical socket in which atubular stem 48 is mounted. Said stem is screw-threaded at its upper endand has a thumb-nut 4.) thereon by which it is supported and ad- Aholder 50 is mounted on the lower end of said stem 48 formed with arecess receive bearing block 51 of wood or ot. suitable material. Eachbearing block 51 formed with a recess to receive l shaft constitutingthe work being e118 ground and hold it steady against spring ing orvibration. The recess 111 each block is formed on the arc of a circlesubstantially corresponding to the.circrunference of the work and aseries of blocks are preferably provided formed with recesses 9ndifferent arcs so that one may be taken out and another of appropriatesize substituted as work of diflerent sizes is put into the machine. llhe holder 50 is supported by a circular, or wedge-shaped, shoe 52interposed between the surface of its rear side and the adjacent surfaceof frame C, which surfaces are at an angle to each other, the distanceand away from the work. It will thus be s n that by means of the twoadjustmenlts provided by the nuts 49 and 5st, the work restmay be raisedor lowered or swung toward or from the work as may be.

desired. To insure that the frame C wili he always normally held towardthe grinding wheel so as tohold the work against said grinding wheel, Imount two springs 66 in casings 67 on the inner side of supports'C' andC respectively, the inner ends of which bear against heads 68 carried onthe inner face of said frame C and norm'ally hold said frame on itspivots toward. 'said grinding wheel.

In Fig. 9 I have shown a diamonding tool for use in turmng the surfaceof the grinding wheel, the same consisting of he bracket mounted on thefront of frame C by means of a clamping bolt 61 engaging with the T-slotin said frame, and compris-v ing an arm 62 carrying a diamond socket 63on its outer end in which the diamond is mounted said socket beingadjusted by means of the adjusting screw 64: and the clamping screw 65to bring it into the proper position opposite the axis of the wheel fortruing the same, as will be readily understood.

In Fig. 6 is illustrated a form of chuck C" used for holding the end ofa master cam having a plain shaft, the same being secured in said chuckby an ordinary key-way and key, as indicated by dotted lines. In Fi 7 isillustrated the form of chuck employed where the end of the cam-shaftpattern carries a disk. In such form the disk of the shaft is secured tothe disk of the chuck by bolts 80.

in Fig. 11 is shown the head-stock spindle 20 with collar 40' clampedthereon engaged with arm 43 of a work engaging sleeve of the formemployed when the end of the shaft is plain. In Fig. 12 I have shown thesame structure except that in lieu of the form of sleeve 1 I have showna sleeve or chuck an adapted to surround the flange on the end of acam-shaft of such a form. ()ther ohvious modifications to adapt theattachment for different forms ofwork maybe made without departing frommy said. invention.

The operation is as follows: \Vhen it swung on the pivots a between saidsupv ports. A pattern of the work to lie-ground, preferably formed ofhardened steel, is mounted in position in the hangers 11 on theunderside of frame C, one end of said pattern being connected' 'o chuckC and thus coupled to the pattern driving shaft 10 through the medium ofthe universal cou' pling before described. -The work to be ground isthen mounted between the centers 29 and 26 carried by the head-stock andtailstock, respectively, on the opposite-side of said frame, the end ofthe work adjacent to the head-stock being connected to the sleeve 42, orcollar 42, according to the .formofthe end of the work, and thus coupledto the head-stock to be driven thereby. While the parts are beingadjusted in position and prepared for. work the frame C is preferablyheld forward and supported on the cam 13 with the pattern free from theshoe 3). i The bracket'B is then adjusted to bring said shoe b in linewith the camof the pattern corresponding tothecam of the work to beground. The leyer 15 is then turned to lower said frame 611 itspivotsuntil the cam of the master rests upon said shoe as beforedescribed. The grinding wheel is then brought'into position to operateupon the cam to be ground and the machine started in operation. -Thework proceeds until the work hasbeen ground to a form to correspond withthe pattern, when the shoe supporting the frame C will support the work.

in contact with the grinding wheel during its entire revolution thusindlcatin that the desired form has been attained. he frame C may thenbe swung on its pivot by means of the lever 15 and cam 13 to lift thepattern free from the supporting shoe, which is then slid along table Binto position to be in line with the cam on the pattern correspondingwith the next cam to be ground, when the frame is again turned down andthe work proceeds as before described. After the several cams of onecam-shaft have been ground, the tail-stock center 26 may be disengagedfrom its endof the work by means of lever 27 and the opposite end thendisengaged from the head'stock and the work removed and another shaftput in place and the same process repeated. During the grindingoperation the brake on the chuck C carrying the pattern is adjusted tomaintain sufficient frictional resistance to prevent any slipping, ormovement of one part of the work faster than another, such as mightoccur when the pattern turns over its point i on the shoe 6 whichwouldcause the gearing to run slightly to take up any slight loosenessthat might be in -the gearing except for such a brake, as will bereadily understood. The master cams or patterns, are provided ofstandard sizes for different characters of work. If it is desired tomake a special cam or adapt the machine for special work it is onlynecessary to make a master, or pattern, of the special form orcharacter'desired. By reference, especially to Fig. 4, it will be notedthat the work at all times bears the same relation to' the grindin wheelthat the pattern does to the curved bearing surface of shoe 6. It willalso be noted that the axis of the work and the axis of the pattern areboth in the arc of a circle of which the pivotal axis of the frame C isthe center so that said corresaid pattern and work-holdin ing arrangedwith their axes in the are of frame, a train of gearing connectin ondingrelationship between cam and s cc, and work and wheel, is alwaysmaintained regardless of any swinging movement of said frame. Theaccurate grinding of the work to correspond to the pattern is thusinsured.

Having thus fully described my said invention, what I claim' as new anddesire to secure by Letters Patent, is:

1. A cam grinding attachment for grinding machines comprising a swingingframe mounted on the work-table of the machine, work-holding devices onsaid swinging frame, pattern holding devices also on said swingingframe, gearing connecting said worleholding and pattern'holding devicesfor driving the work and pattern uniformly,

devices bea circle the center of which is the pivotal center of'saidframe, substantially as set forth.

2. A cam grinding attachment for grinding machines comprising supportsmounted on the work-table of the machine, a frame mounted to swing onpivots between said supports, a head-stock and tail-stock for supportingthe work mounted on one side of said frame below the line of its pivots,

bearings carried on the other side of said frame in a line below. itsplvots, a master or pattern shaft mounted in said bearings,

a shoe mounted on an adjustable support on saidtable and formed with acurved bearing surface corresponding substantially to the curvature ofthe grinding wheel, a chuck for engaging said pattern mounted on the endof a shaft journaled i1; said pivoted said shaft with the shaft of thehead-stoc r, and driving gear connected with said train of gearing,substantially as set forth.

3.'A cam grinding attachment for grinding machines comprising supportsmounted on the work-table of the machine, a frame mounted between saidsupports on pivots, a master or pattein shaft mounted in suitablebearings on said frame, a bearing shoe supported on the machine tableand adapted to contact with the pattern, a pattern driving shaftjournaled in hearings in said frame substantially in axial alinementwith said pattern shaft, a chuck on the inner end of said shaftconnected therewith by a uni.- versal coupling and adapted to connectwith the end of said pattern shaft, work-holding devices also mounted onsaid frame, and driving gear for'driving said work-holding devices ahdsaid pattern driving shaft simultaneously, substantially as set forth.

4. A cam grinding attachment for rinding machines comprising a swingingrams, work-holding devices mounted 011 said swinging frame on e of whichisjournaled to be driven, pattern holding devices axially spaced fromsaid Work holding devices also mounted on said swinging frame adjacentto the head-stock driving shaft, a chuck on said pattern driving shaftfor receiving and holding the pattern, a train of gearing between thepattern driving shaft and the head-stock driving shaft for driving thesame uniformly, and a main driving shaft connected with saidtrain ofgearing, substantially as set forth.

5. A cam grinding attachment for grinding machines comprising a framemounted to swin on pivots above the work-table of the machine,work-holding devices mounted on said frame, a pattern mounted inbearings also earned by said frame, a pattern drlving shaft journaled inbearings H1 said frame, a chuck engaged with said pattern and coupled tothe pattern driving shaft by a universal joint to permit slightvariation between theaxial ahnement of the driving shaft and thepattern, said coupling coming machines comprising aswinging frame,

work-supports on said frame, a pattern on said frame, a bearing on theWorl -table for said pattern to rest upon, gearing for driving thepattern and the work and a brake for engaging one of the driven partsand hold the same under tension, whereby any slipping or backdash isprevented during .the operation of grinding, substantially as set forth.

7. A cam grinding attachment for grinding machines comprising a swingingframe, work-carnying devices on said inner frame,

a pattern carried by said swinging frame,

gearing for driving the work and the pattern, and a friction brakemounted to engage the pattern driving means and hold the same undertension, substantially as set forth 8. A cam grinding attachment forgrinding machines comprising a swinging frame,

work-holding devices thereon,. a patternshaft mounted in bearingscarried by said frame, a driving shaft, a chuck coupled to said drivingshaft and to said pattern shaft, abrake comprising friction shoessurrounding said chuck and clamped thereto by clamping screws, and meansfor holding said brake from turning with said chuck, whereby saidpattern driving'means is held against any movement except that caused bythe driving mechanism, substantially as set forth,

9. A cam grinding attachment for grinding machines comprising a pivotedframe,

forth.

Work-holding devices mounted on said frame, a pattern mounted inbearings axially spaced from said work holding devices also on saidframe, a shoe mounted in a support-on the machine table against whichthepattern is adapted to rest, thebearing face of said shoe being formed inthe arc of a circle of substantially the same diameter as the grindingwheel, substantially as set forth. V

10. A cam grinding attachment for grinding machines comprising a framemounted to swing on horizontal pivots between suitable supports,work-holding devices on said frame, a pattern ournaled on saidframe,

i a head-stock and tail-stock mounted at oppcsite ends of said frame,said frame being formed with a longitudinal projecting flange,work-rests adapted to support the work between said headstock andtail-stock hung upon said flange, means for adjusting said work-rests toadapt them for work ofdifferent sizes, a pattern also on said swingingframe, a supporting shoe for said pattern, and gearing for driving boththe work and the pattern, substantially as set 12. A cam grindingattachment for grind} ing machines comprising a swinging frame. ahead-stock and tail-stock mounted on said frame'for supporting the work,a pattern mounted on said frame, a stationary bearing for said patternto rest upon, gearing for driving both the work and the pattern and. aclamping sleeve adapted to be clamped upon one end of the work andconnected with a collar clamped upon the head-stock, and said collar,substantially as set forth.

13. A cam grinding attachment for grinding machines comprising aswinging frame, a head-stock and tail-stock for carryiiig the workmounted on said frame, said head stock being journaied to be driven inbearinns and said tail-stock being mounted to be adjusted longitudinallyon said frame, a pattern also carried by said frame axially spaced fromthe Work, a stationary rest against which said pattern is adapted tobear, and means for driving both the pattern and the headstock,substantially as set forth 14. A cam grinding attachmept for grindingmachines comprising a swinging frame mounted on the work-table 0f themachine,

said table being formed with a longitudinal 1 projecting flange on oneside, a head-stock for driving both'the pattern and headstock,

substantially as set forth. v 15. A cam grinding attachmentrfor grindingmachines comprising a swinging frame mounted on the work-table of themachine, a longitudinally projecting flange on the face of said frameadjacent to the grinding Wheel, a tail-stock mounted on said frame toengage with said flange and secured to beadjusted longitudinally, workrests also mounted to engage with said flange and be adjustedlongitudinally, a head-stock spindle lournaled in bearings in the end ofsaid frame in line with said tail-stock, a pattern mounted on theopposite side of said frame, a stationary rest for said pattern, andgearing for driving both the pattern and the head-stock, substantiallyas set forth.

16. A cam grinding attachment for grind ing machines comprising apivoted frame mounted on the Work-table of the machine,

Work-holding devices on the side of said I frame adjacent to thegrinding wheel, bearings adjustably hung on the opposite side of saidframe, means for adjusting said bearings, a pattern shaft journaled insaid bearings, a rest for said pattern to bear against, and gearing fordriving the pattern and Work, substantially as set fort 17. A camgrinding attachment for grinding machines comprisin a pivoted framemounted onthe work-ta led the machine, work-holding devices on the sidesof said firame adjacent to'the grinding wheel, said frame being formedwith a longitudinal T- groove in an overhanging part on its oppositeside, hangers mounted by means of a clamping bolts in said groove andformed with bearings intheir lower-ends, a pattern mounted in saidbearings, a pattern driving shaft coupled to said pattern, and gearinfor driving said patterndriving shaft an d as set forth.

In Witness whereof, I, have hereunto set my hand and seal at'Vvaynesboro, Pennsyl- Vania this 28th day of November, A. I nineteenhundred and ten.

HARRY T. SHEARER. [11. a] VV'tnesses:

J. ARTHUR KNAPP, CHAS. l3. CLAYTO the work-holding devices,substantially

